Control Panel Applet meets dynamic icons

From:

"Alex Shulgin" <alex.shulgin@gmail.com>

Newsgroups:

microsoft.public.vc.language

Date:

16 Mar 2007 06:37:41 -0700

Message-ID:

<1174052261.864421.133480@y80g2000hsf.googlegroups.com>

Hi!

I've been trying to create a control panel applet which will provide
dynamic items based on some externally configurable data. However, I
cannot manage to get it working because icons won't display properly.

I handle CPL_INQUIRE like this:

lpCplInfo->lData = 0;
lpCplInfo->idIcon = CPL_DYNAMIC_RES;
lpCplInfo->idName = CPL_DYNAMIC_RES;
lpCplInfo->idInfo = CPL_DYNAMIC_RES;

and in the CPL_NEWINQUIRE handler I use LoadImage() function to load
the icon, like this:

HICON icon = (HICON) ::LoadImage(NULL,
    iconPath,
    IMAGE_ICON,
    0, 0,
    LR_LOADFROMFILE | LR_DEFAULTSIZE);
lpNewCplInfo->hIcon = icon;

The icon loaded correctly, but never displayed (i.e. the result is the
same as putting NULL into hIcon field).

Some more points:
1. The szName and szInfo fields of NEWCPLINFO structure I set are in
effect and Control Panel actually displays them.
2. I've tried to add LR_DEFAULTCOLOR to the flags in call to
LoadImage, but it didn't make any difference.
3. When I using resource id of some icon built in into my .cpl file in
place of CPL_DYNAMIC_RES I get that test icon displayed properly.

What could be the problem?

--
Alex Shulgin